Use of K(n d) Rydberg atoms to investigate low-energy electron attachment to C2Cl4

An investigation of electron attachment to tetrachloroethylene (C2Cl4) at subthermal energies through studies of K(nd)–C2Cl4 collisions (12≤n≤100) is reported. The data indicate that electron capture can result in the formation of Cl− ions, relatively long-lived C2Cl−4 ions, and C2Cl−4 ions that undergo rapid autodetachment. Cross sections for the production of Cl− and long-lived C2Cl−4 ions through electron capture are derived from the Rydberg atom data and are compared to results obtained using swarm and threshold photoelectron spectroscopy techniques.